Metro-North commuters boarding the 5:30 a.m. train in Port Chester. Metro-North says regular service will resume Monday on the New Haven Line.

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Metro-North Railroad trains on the New Haven Line will resume regular service Monday after a new electrical substation in Mount Vernon passed initial testing, railroad officials said Saturday.

New Haven Line trains will operate on a reduced hourly schedule Sunday - about 70 percent of normal weekend service - as Metro-North breaks in the new substation, officials said. Bicycles won't be allowed on the trains until Monday, and Sunday ...